Question

How do I solve this

Answer 1

Pythagorean theorm is( hypotenuse)^2=(base)^2+(perpendicular)^2
(18)^2-(9)^2=x^2
x=15.58

Answer 2

You could solve it with the theorem which is a^2+b^2=c^2. Or you could use the formula for a 30,60,90 triangle and multiple 9 by the square root of 3. The answer is 15.59